//designpatterns.interpreter.DistanceNode.java
package interpreter;
//距离解释：终结符表达式
public class DistanceNode extends AbstractNode {
	private String distance;

	public DistanceNode(String distance) {
		this.distance = distance;
	}

	//距离表达式的解释操作
	@Override
	public String interpret() {
		return this.distance;
	}
}